We have been keeping other sites on our domain while we build them for clients and not taking them off afterwards
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So when I look in wmt its telling me our site is about fish oil etc when we are web designers.
We have blocked these pages in robots text and removed them.
WMT is showing 500 errors in crawl errors and telling us we have health issues on our site.
what should we do and how do i bulk select these errors is wmt to mark as fixed (if they are fixed)
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You should return a 410 status, or at least a 404, after a while the y will realize the pages no longer exist
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As well as following Alan's advice I would also create an xml site map of your site and submit Google & Bing.
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Creating a new sitemap and submitting it should get rid of those errors. And might I suggest you setup a development domain so you won't have these problems again in future?

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